We evaluated the effects of pruning on the concentration and total amount of radiocaesium in Japanese chestnut trees (Castanea crenata Sieb. et Zucc. ‘Porotan’) after radionuclide deposition from the nuclear accident at the Fukushima Daiichi Nuclear Power Plant. In March 2013 (2 years after the accident), trees grown in Ibaraki Prefecture were subjected to heavy or conventional pruning, or no pruning as a control. Over the next 2 years, pruning significantly decreased the yield of fruits, but did not significantly affect the concentration of radiocaesium in new organs including fruits. Two years after the treatments, the total amount of radiocaesium in a tree was reduced by 13％ by conventional pruning and by 36％ by heavy pruning in comparison with that in control. Furthermore, the distribution of radiocaesium in a tree two years after the treatment suggested that, unlike radioactive postasium, radiocaesium in new organs was not derived from the soil through root uptake but was translocated from old branches and trunks which exposed at the time of radionuclide deposition.
Natural γ ray dose rates were measured at 279 points in the Nakatajima dune along with the beach located in Hamamatsu City, Shizuoka Prefecture. The dose rate increased gradually from the shoreline to the dune, and revealed an approximately constant value on the entire area of the dune. As a result of spectrum measurements there, although the concentrations of potassium in the beach amounted to almost the same levels as those in the dune, the concentrations of Thorium in the dune were considerably high compared to those in the beach. A proto-type model was proposed in this paper to interpret the phenomena.
Abundant intracellular and cell wall Strontium sorption has been identified in phytoplankton biomass and Pectinatella magnifica by SEM-EDS and ICP-MS. Both of them thrive in polluted waters of the paddy pond district, where pH 7–8.5 and 20–30°C, C (42.9 wt％), H (5.8 wt％) and N (7.6 wt％) during summer in 2015. The isolates of phytoplankton community and Pectinatella magnifica contain 0.65 mg/L Sr by dry weight, using ICP-MS method. Concentration factors for Rb 1–1.55 mass％ and Sr 5–7.5 mass％ in the point analyses, using SEM-EDS method, endorsing the role of microorganisms in mediating transfer of metal solutes from the hydrosphere to sediments. We report here the Sr sorption previously unrecognized in phytoplankton biomass and Pectinatella magnifica. Here, we describe the simple preparation of removal strontium from contaminated water in pond associated with phytoplankton biomass and Pectinatella magnifica by use of heated zeolite adsorbent. Strontium adsorptive burn zeolite particles settle done and become clear water for few months.
Manganese oxides with cubic perovskite structure, AMnO3, are famous materials where the so-called colossal magnetoresistance effect arises upon hole doping on Mn sites. The materials are regarded as a typical system where coupling of degrees of freedom of spin, orbital, and charge induces a variety of physical properties. The fundamental properties of this system and the typical magnetic and orbital orderings are briefly described. Inelastic neutron scattering studies of the spin waves to clarify the influence of the double-exchange interaction and the orbital orderings on the magnetic interactions are reviewed.